I have had no on-board compressor, and have/had an on-board compressor. I recently changed Trucks, and moved my on-board compressor and added air bags.
On my current truck, I use my airbags to to level side to side when camping with my TC. It is very convenient having the on-board compressor. I do not need the airbags for my 4200 lb TC, due to the existing suspension. NOTE, DO NOT NEED. That said, should I tow a heavy trailer, it could be to my advantage having the air bags. There are circumstances that an on-board compressor is nice, if you want to spend the money.
I also have a 5th wheel. I have had occasions where I did not want to disconnect from the 5th wheel, but needed to raise the front of the 5th wheel. Rather than use blocks and other stuff, it was very convenient to simply raise the 5th wheel plate in the truck with the air bags.
Wayne
